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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5de5be60e73020a7eac5b15f2371eb9a7fec772cfc1f2cbe236ba99c96cd110' 
  AND token = '7ooXL+063iIRQJjpHDpCEl42GwK30AGdp6uqgPN/dgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}